You need to calibrate that pH probe before you do anything based upon what it says.
In addition, I think your plan to move your pH upward is dangerous. The additive you are looking at will alter your Ca/Alk balance by raising Alk. That is something that can cause a lot more problems than low pH.
Given you aren't running your Ca reactor yet, I suspect that you don't have a seriously low pH problem anyway.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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